Let us first consider the 4D representation of Light Fields in [1]} and Lumigraph in [2]} parameterized with two parallel planes, as illustrated in Fig. REF . The 4D representation describes the radiance along rays by a function \(L(x,y,u,v)\)  where the pairs \((x,y)\)  and \((u,v)\)  respectively represent spatial and angular coordinates.
For simplicity of notation, we consider a 2D Light Field \(L(x,u)\)  with one spatial dimension \(x\)  and one angular dimension \(v\) , but the generalization to a 4D Light Field \(L(x,y,u,v)\)  is straightforward.
